Abstract: Video coding and decoding apparatuses that can enhance coding efficiency are provided. A video decoding apparatus includes an OOB determination unit configured to determine whether a reference block is targeted for OOB processing by comparing coordinates of the reference block with coordinates of a picture, and an OOB mask derivation unit configured to derive mask data representing availability of each pixel by comparing coordinates of a pixel included in the reference block with coordinates of the picture. The OOB determination unit determines whether the reference block is the target of the OOB processing by detecting whether wrap-around processing is applied to a reference picture including the reference block. The OOB determination unit determines whether the reference block is targeted for the OOB processing by detecting whether reference picture resampling processing is applied to the reference picture including the reference block.

Abstract: Video coding and decoding apparatuses that can enhance coding efficiency are provided. A video decoding apparatus according to an aspect of the present invention is a video decoding apparatus including a parameter decoder configured to decode, from coded data, syntax (mts_idx) of a target block. The parameter decoder decodes mts_idx depending on a block size, a LAST position, and a non-zero coefficient position of the target block. The parameter decoder determines whether to decode mts_idx, using a threshold for the LAST position. The threshold is larger in a case that the block size is equal to or larger than a prescribed size than in a case that the block size is smaller than the prescribed size.

Abstract: An image decoding apparatus and an image coding apparatus that reduce complexity of high image quality processing are implemented. The image decoding apparatus includes an inter prediction parameter decoding processing unit that includes processing of, regarding two motion vectors, modifying the two motion vectors from an error of two prediction images. In a case that neither of the two prediction images is a case of weighted prediction, the processing of modifying the two motion vectors is performed.

Abstract: The number of weights of a reference list from coded data is decoded. The number of the weights of the reference list is set equal to or more than 1. A flag indicating whether a weight coefficient and an offset value are present is decoded for each index of the reference list, according to the number of the weights. The weight coefficient and the offset value are decoded in a case that a value of the flag is true. An interpolation image of a reference picture is multiplied by the weight coefficient, the offset value is added, and a prediction image is generated.

Abstract: In a case that two reference picture lists are selected with one index value, the reference picture lists may not be determinable depending on the number of two reference picture list structures. Provided is a prediction unit that decodes a reference picture list structure including multiple reference picture lists and selects two reference picture lists from the reference picture list structure for each picture or for each slice. The prediction unit selects two reference picture lists with one index value depending on the number of two reference picture list structures.

Abstract: A video decoding apparatus is a video decoding apparatus for deriving a prediction image by using a reference picture included in a reference picture list.

Abstract: To improve the prediction accuracy of the SGPM method, the candidate list of the SGPM method can be expanded. The number and content of the expansion can be selected according to the size and shape of the target block. Also to reduce the complexity of the SGPM, DIMD and TIMD methods. This is achieved by reducing the dependency between SGPM, DIMD and TIMD methods and reducing the number of candidate modes in TIMD.

Abstract: An image decoding apparatus and an image coding apparatus that reduce complexity of high image quality processing are implemented. The image decoding apparatus includes an inter prediction parameter decoding processing unit that includes processing of, regarding two motion vectors, modifying the two motion vectors from an error of two prediction images. In a case that neither of the two prediction images is a case of weighted prediction, the processing of modifying the two motion vectors is performed.

Abstract: A problem with known SEI is that a relationship between a target image and an input tensor of a neural network model and a relationship between an output tensor and an output image are undefined or insufficient, and thus processing cannot be performed by simply using a model. Another problem is that in a case that the color component of the output image and the color component of the target image are different from each other, processing cannot be performed. An aspect of the present invention provides a video decoding apparatus including a prediction image derivation unit configured to decode a prediction image, and a residual decoder configured to decode a residual, wherein an input tensor is derived from a parameter indicating the number of channels of the input tensor and the output tensor of the neural network model or an image is derived from the output tensor.

Abstract: The number of weights of a reference list from coded data is decoded. The number of the weights of the reference list is set equal to or more than 1. A flag indicating whether a weight coefficient and an offset value are present is decoded for each index of the reference list, according to the number of the weights. The weight coefficient and the offset value are decoded in a case that a value of the flag is true. An interpolation image of a reference picture is multiplied by the weight coefficient, the offset value is added, and a prediction image is generated.

Abstract: In a case that two reference picture lists are selected with one index value, the reference picture lists may not be determinable depending on the number of two reference picture list structures. Provided is a prediction unit that decodes a reference picture list structure including multiple reference picture lists and selects two reference picture lists from the reference picture list structure for each picture or for each slice. The prediction unit selects two reference picture lists with one index value depending on the number of two reference picture list structures.

Abstract: A video coding/decoding apparatus that can enhance coding efficiency using non-separable transform is provided. A video decoding apparatus according to an aspect of the present invention includes a prediction image generation unit configured to generate a prediction image, and an inverse non-separable transform processing unit configured to perform inverse non-separable transform. The non-separable transform processing unit does not change a specific frequency component of a transform coefficient.

Abstract: In a case that a scaling value of neural network filter strength is set equal to 0, a decoded image before a deblocking filter is output, and thus block noise occurs. In a case that luma and chroma parameters are not taken into consideration, processing for an image of multiple transfer functions and chroma parameters is not appropriately performed. In a unit of a prescribed block, by using a parameter indicating a degree of application of the NN filter, an image after the deblocking filter and an image after an NN filter are combined using a different ratio of the images. Filter processing of a luma image is switched based on a luma parameter, and filter processing of a chroma image is switched based on a chroma parameter.

Abstract: An adaptive motion vector prediction unit configured to adaptively perform spatial prediction that performs prediction using a motion vector around a target block and temporal prediction that performs prediction using a motion vector of a collocated picture is included, and in the temporal prediction performed by the adaptive motion vector prediction unit, the collocated picture to be referred to is designated on a per picture basis, and a reference list is designated on a per slice basis.

Abstract: In a case that all network parameters are adaptively switched, it is difficult to switch the parameters for each small block, such as a CTU. There is a problem in that, in a case that ALF class classification and filtering are successively performed in ALF parallel after application of an NN filter, processing requires time. By selecting an NN model in a slice header and selecting a network layer finetuned in a CTU, the NN model can be adaptively selected even for each small block. By performing ALF class classification in an image before being subjected to an NN filter and performing ALF processing using an image subjected to NN filtering processing and ALF class information, the NN filtering processing and the ALF class classification can be performed in parallel.

Abstract: A device may comprise one or more processors configured to: derive variables BitDepthY and BitDepthC equal to BitDepthY and BitDepthC; decode a slice QP SliceQPY and a offset QpBdOffsetY; derive StrengthControlVal equal to a value of (SliceQpY+QpBdOffsetY)÷(51+QpBdOffsetY) of a first slice of current coded picture; and set StrengthControlVal to an input tensor.

Abstract: Video coding and decoding apparatuses that can enhance coding efficiency are provided. A video decoding apparatus according to an aspect of the present invention includes a parameter decoder configured to decode a transform coefficient and a coefficient sign prediction error from coded data, and a sign prediction unit configured to predict a sign of the transform coefficient. The sign prediction unit derives a cost with reference to a boundary pixel with a neighboring block for a candidate of a combination of signs of transform coefficients without sign information, selects the sign, based on the cost, and modifies the predicted transform coefficient sign, using the coefficient sign prediction error decoded by the parameter decoder. The sign prediction unit divides the transform coefficients without the sign information into multiple groups, and performs the prediction on a transform coefficient of the transform coefficients for each of the multiple groups.

Abstract: Video coding and decoding apparatuses that can enhance coding efficiency are provided. A video decoding apparatus includes an OOB determination unit configured to determine whether a reference block is targeted for OOB processing by comparing coordinates of the reference block with coordinates of a picture, and an OOB mask derivation unit configured to derive mask data representing availability of each pixel by comparing coordinates of a pixel included in the reference block with coordinates of the picture. The OOB determination unit determines whether the reference block is the target of the OOB processing by detecting whether wrap-around processing is applied to a reference picture including the reference block. The OOB determination unit determines whether the reference block is targeted for the OOB processing by detecting whether reference picture resampling processing is applied to the reference picture including the reference block.

Abstract: In the related art, in some cases the weighted prediction processing is performed even in a case that normal prediction processing is to be performed. A video decoding apparatus includes a weighted prediction processing unit configured to decode a weight coefficient and an offset value from coded data and to generate a prediction image by multiplying an interpolation image by the weight coefficient and adding the offset value to the interpolation image, and a normal prediction processing unit configured to generate a prediction image from the interpolation image. In a case that in the weighted prediction processing unit, a bi-prediction is performed and information of the weight coefficient and the offset value is absent for both a reference list 0 and a reference list 1, the normal prediction processing unit generates a bi-prediction image.

Abstract: An arithmetic coding scheme is provided for coding and decoding 3D data and improves coding efficiency for mesh displacements and high-quality coding, and decoding of the 3D data. A 3D data decoding apparatus is also provided for decoding coded data. The apparatus contains an arithmetic decoder that is configured to arithmetically decode a mesh displacement from the coded data. The arithmetic decoder decodes, from the coded data, a first flag indicating whether a coefficient of the mesh displacement has an absolute value greater than 0, a second flag indicating whether the coefficient has an absolute value greater than 1, and a third flag indicating whether the coefficient has an absolute value greater than 2.